Since Jack was laid off from his job three months ago, he       a new one, but without luck.

A．1ooked for

B．had looked for

C．is looking for

D．has been loking for

腹腔内多次手术易引起

A．粘连性肠梗阻
B．肠扭转
C．肠套叠
D．嵌顿疝
E．蛔虫性肠梗阻